Battery size

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Battery size

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16 February 2022 at 21:06 #99534
Cliff Murphy 1
Participant
@cliffmurphy1
I am building an aircraft carrier the deck is 54”. The 2 motors are

Hanpose 775a motor.

my Question is, What size battery would properly drive boat?

Thank you in advance Cliff
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16 February 2022 at 21:06 #3051
Cliff Murphy 1
Participant
@cliffmurphy1
17 February 2022 at 18:21 #99545
Colin Bishop
Moderator
@colinbishop34627
Hi Cliff,

Not enough information I'm afraid. There are three versions of this motor with different power ratings. Which ones do you have?

How much will the model weigh?

What is the diameter of the propellers?

With this information someone on here might be able to make an informed guess but a model that size will be pulling a lot of amps. You will need to make sure the speed controllers can cope too.

Colin
17 February 2022 at 22:58 #99547
Dave Cooper 6
Participant
@davecooper6
Cliff

A lot may depend on whether you're aiming for a scale speed or, not ? Is 54" the deck beam or, length ?

A full-size carrier will steam at around 35 knots (into wind) to launch /retrieve aircraft. so, you can factor this down to get a reasonable scale speed. As for realism, a small model carrier (if 54" is the length overall), may look a bit silly unless, perhaps, the water is flat calm. Any wind, or chop, will have it bouncing around quite a lot I would think…

Full-size displacement is around 90,000 tons (Nimitz class) – they aren't really affected by chop only a largish swell or, BIG waves. If you are still at the design stage, then I would re-think the size /mass /displacement thing.

I think they can look very impressive in model form, but, they need to suggest the 'massiveness' of the real thing.

Just my 'two-penneth' – others may disagree

Dave

(Ex-Fleet Air Arm Aircraft Engineering)

Edited By Dave Cooper 6 on 17/02/2022 23:02:15
18 February 2022 at 00:29 #99549
ashley needham
Participant
@ashleyneedham69188
Here’s the thing. Model boats imitating very large vessels need to be heavy in order to have a “solid presence” on the water. All my warships are extra deep so that they have a good weight to them and are solid in a chop.

It ones not make for a realistic hull of course, but I know what I would sooner have.

Agree with Dave, even a good scale model that it will bob up and down unless it has a good weight to it.

Ashley
18 February 2022 at 08:52 #99550
Richard Simpson
Participant
@richardsimpson88330
Cliff welcome to the forum and your question. There are three main considerations with a battery that should all be given equal thought when planning your installation, voltage, capacity and type. You need to better elaborate on what you want before you can match the battery to these requirements.

i.e. how fast do you want the model to go, how long do you want it to remain on the water before requiring charging and what type of battery suits the ballast requirements of the model best.
18 February 2022 at 08:54 #99551
Charles Oates
Participant
@charlesoates31738
Hi Cliff, I'll do a bit of informed guess work for you. I'm pretty sure your model is 54 inches long, not beam, as has been asked. The Hanpose motors can be 12 or 24 volts, so I'll presume you got the 12 volt versions, and that you fitted some reasonable propellers, perhaps 40 mm ones, or near that size.

If all that is near the mark, I would get 5 ah ( 5000 mah) nimh batteries, and 25 amp mtronics speed controllers, two sets, one for each motor. Lead acid batteries might be tempting, because the weight can be used as ballast, but wouldn't be my choice because the voltage can fall off with higher ampage motors.

There are many other ways of doing this, each of us has our preferences, but the above should give you some idea.

A last point, please respond to your replies, we often find that new posters forget to come back to us, and everyone on here would like your model to be a success.

Charles.
18 February 2022 at 09:55 #99552
Ray Wood 3
Participant
@raywood3
Hi All,

While we wait with baited breath for more info from Cliff on what he maybe building, It strikes me that a carrier which averaged 750 feet long this would make the scale around 1 – 150 this is a relatively small ship and will be massively overpowered by 775 motors. 385's would be much more suitable for a carrier this size.

Lead acid batteries for ballast would be my guess, but if alternative ballast is planned nimh as Charles suggests will be fine

Regards Ray
18 February 2022 at 22:02 #99559
Cliff Murphy 1
Participant
@cliffmurphy1
Thank You everyone for the input. Charles hit the description close to spot on. I will be using the 5200amh 7.4v. The 775s will remain. I’m sure that ballast will be added for stability.
This is my second boat, the first never made it to the water. Battleship

Thank You Cliff
18 February 2022 at 23:45 #99560
Charles Oates
Participant
@charlesoates31738
I'm glad we were able to help Cliff, good luck with your model. As you progress, we would like some pictures, Carriers aren't very common, so a new one is always of interest.

Feel free to ask about anything you need to.

Charles.
19 February 2022 at 08:35 #99563
ashley needham
Participant
@ashleyneedham69188
Agree with Ray here on motor size although I might use a pair of the 6-12v 500s.

However if the motors have been purchased already then I suppose you should use them.

Our man here is building a 96 inch (8 foot) carrier and he is using 4x 800’s on I think 40 or 45mm props.

Ashley
19 February 2022 at 14:12 #99570
Cliff Murphy 1
Participant
@cliffmurphy1
Thanks All,

i’m building with Balsa! What is your preferred building material? 96” is a big ship,
19 February 2022 at 15:58 #99571
ashley needham
Participant
@ashleyneedham69188
It’s not me building the big carrier. It was started by someone else entirely before our man Noel was talked into buying it for our delectation, and has a keel of about a 2 inch square oak stick, 1/2 in framing and has now been covered in 1/4 ply strips before being fibreglassed !

its a big thing..

Ashley
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